Hello, I tried looking through the program, and I couldn't figure out where BOINC stores data on my computer. I am just curious, as I'm not particularly computer savvy. I didn't see it in any of the program folders and I didn't see a documents directory.

Also, if I allow BOINC a total of 10GB on my HDD, does it erase previous calculated data saved on my computer in order to work on other projects?

Sorry if these are really basic questions, but I can't seem to find any information directly through the menus of the program.

If you can't find it, it may be hidden by Windows.
See this FAQ for the default locations on various OSs.

No, BOINC won't delete previous data.
The science applications should delete their old, completed files, and if not, and you run out of room, Then they'll stop/crash/warn you that you need more room to download more WU's.

Thanks you. I didn't realize the information was in a hidden folder.